Cross platform conversions of degree symbol (˚, °,&

On my mac there are different ways to make the Degrees symbol

opt-shft-8 (my preferred way)
and on the PC i don’t know what they do but the symbol comes over as “∞”
what can i do to make sure they use the correct ascii code for the opt-shft-8 degrees symbol?

˚ this one is OK
° this one is preferred
∞ this one looks like infinity symbol

If you are referring to HTML entities, the one for degrees is °

a complete list can be found at this address…Character Entities and HTML Escape Sequence Table

wasn’t refering to HTML the forum converted it was actually refering the codes i mentioned
unknown pc character that looks like infinity symbol (or the number 8 sideways)